Re: Display of Lao script

[Stephen Berman <stephen.berman@gmx.net>]

On Tue, 24 Oct 2017 21:04:21 +0900 handa <handa@gnu.org> wrote:

> In article <87k1zk6f01.fsf@gmx.net>, Stephen Berman <stephen.berman@gmx.net> writes:
>
>> > 1. Move LAOO-*.flt (except for LAOO-OTF.flt) from /usr/share/m17n to,
>> >    for instance /tmp.
>> > 2. Prepare a file that contains the Lao line only.
>> > 3. Run emacs as this:
>> >    % MDEBUG_DATABASE=1 MDEBUG_FLT=3 emacs
>> > 4. Visit the Lao only file.
>
>> I did this and the display of the Lao script is the same as before
>> (i.e., with the composed characters not properly aligned).  Here is the
>> entire debugging output:
> [...]
>>  [DB]  <font,layouter,hebr-ff,nil>.
>>  [DB]  <font,layouter,thaa-otf,nil>.
>>  [DB]  <font,layouter,cham-generic,nil>.
>
>> FWIW, when I change the font to DejaVu Sans (not Mono) and visit that
>> file, the display of all but one of the composed characters is correct
>> (as I previously mentioned), and the debugging output is exactly the
>> same as the above;
>
> Could you please put the attached version of LAOO-OTF.flt under
> /usr/share/m17n (without any other LAOO-*.flt), and try again?

With this version the Lao composed characters display correctly; FYI the
debugging output is appended below.  (With this version the variable
pitch DejaVu Sans also correctly displays the character compositions,
including the one that was previously incorrectly displayed with this
font.)  However, when I move the LAOO-{ALICE,GENERIC,MULE}.flt files
back to /usr/share/m17n, leaving the new LAOO-OTF.flt there, the display
is again incorrect and the debugging output shows laoo-generic being
used.

Steve Berman

 [DB]  <font,layouter,hebr,nil>.
 [DB]  <font,layouter,mlym-rachana,nil>.
 [DB]  <font,layouter,thai-norasi,nil>.
 [DB]  <font,layouter,bng2-otf,nil>.
 [DB]  <font,layouter,hebr-otf,nil>.
 [DB]  <font,layouter,tml2-otf,nil>.
 [DB]  <font,layouter,orya-otf,nil>.
 [DB]  <font,layouter,ory2-otf,nil>.
 [DB]  <font,layouter,mymr-myazedi,nil>.
 [DB]  <font,layouter,mlym-otf,nil>.
 [DB]  <font,layouter,knd2-otf,nil>.
 [DB]  <font,layouter,tel2-otf,nil>.
 [DB]  <font,layouter,syrc-otf,nil>.
 [DB]  <font,layouter,arab-otf,nil>.
 [DB]  <font,layouter,mlym-cdac,nil>.
 [DB]  <font,layouter,taml-otf,nil>.
 [DB]  <font,layouter,knda-otf,nil>.
 [DB]  <font,layouter,gujr-otf,nil>.
 [DB]  <font,layouter,deve-cdac,nil>.
 [DB]  <font,layouter,guru-otf,nil>.
 [DB]  <font,layouter,arab,nil>.
 [DB]  <font,layouter,thai-tis620,nil>.
 [DB]  <font,layouter,thai-otf,nil>.
 [DB]  <font,layouter,gjr2-otf,nil>.
 [DB]  <font,layouter,tibt-mule,nil>.
 [DB]  <font,layouter,no-ctl,nil>.
 [DB]  <font,layouter,khmr-anlong,nil>.
 [DB]  <font,layouter,deva-otf,nil>.
 [DB]  <font,layouter,telu-otf,nil>.
 [DB]  <font,layouter,mymr-sil,nil>.
 [DB]  <font,layouter,mlm2-otf,nil>.
 [DB]  <font,layouter,thai-generic,nil>.
 [DB]  <font,layouter,dev2-otf,nil>.
 [DB]  <font,layouter,sinh-otf,nil>.
 [DB]  <font,layouter,taml-cdac,nil>.
 [DB]  <font,layouter,gur2-otf,nil>.
 [DB]  <font,layouter,tibt-otf,nil>.
 [DB]  <font,layouter,khmr-otf,nil>.
 [DB]  <font,layouter,tibt-mtib,nil>.
 [DB]  <font,layouter,beng-otf,nil>.
 [DB]  <font,layouter,combining,nil>.
 [DB]  <font,layouter,laoo-otf,nil>.
 [DB]  <font,layouter,arab-otf-no-gpos,nil>.
 [DB]  <font,layouter,hebr-ff,nil>.
 [DB]  <font,layouter,thaa-otf,nil>.
 [DB]  <font,layouter,cham-generic,nil>.
 [DB] <font,layouter,laoo-otf,nil> from /usr/share/m17n/LAOO-OTF.flt
 [FLT] (laoo-otf (dejavu sans mono)
 [FLT]   (SOURCE 0E94 0EB5)
 [FLT]   (STAGE 0 "CV" (0E94 0EB5)
 [FLT]     (SUBPART 0
 [FLT]      (COND
 [FLT]       (REGEX "^CS?V?T?" "CV" 2
 [FLT]        <0
 [FLT]        |
 [FLT]        (COPY 0xE94)
 [FLT]        (COPY 0xEB5)
 [FLT]        | 2>))
 [FLT]      (COND)))
 [FLT]   (STAGE 1 " CV " (| 0E94 0EB5 |)
 [FLT]     (SUBPART 0
 [FLT]      (COND
 [FLT]       (REGEX "^ ([^ ]*) " " CV " 4
 [FLT]        (SUBPART 1
 [FLT]         :otf=lao =)))
 [FLT]      (COND)))
 [FLT]   (RESULT 00-01 (04BA 576 0 0) (04D4 0 -576 -20)))
 [FLT] (laoo-otf (dejavu sans mono)
 [FLT]   (SOURCE 0E82 0ECD)
 [FLT]   (STAGE 0 "CV" (0E82 0ECD)
 [FLT]     (SUBPART 0
 [FLT]      (COND
 [FLT]       (REGEX "^CS?V?T?" "CV" 2
 [FLT]        <0
 [FLT]        |
 [FLT]        (COPY 0xE82)
 [FLT]        (COPY 0xECD)
 [FLT]        | 2>))
 [FLT]      (COND)))
 [FLT]   (STAGE 1 " CV " (| 0E82 0ECD |)
 [FLT]     (SUBPART 0
 [FLT]      (COND
 [FLT]       (REGEX "^ ([^ ]*) " " CV " 4
 [FLT]        (SUBPART 1
 [FLT]         :otf=lao =)))
 [FLT]      (COND)))
 [FLT]   (RESULT 00-01 (04B4 576 0 0) (04E0 0 -576 -30)))
 [FLT] (laoo-otf (dejavu sans mono)
 [FLT]   (SOURCE 0EAB 0EC9)
 [FLT]   (STAGE 0 "CT" (0EAB 0EC9)
 [FLT]     (SUBPART 0
 [FLT]      (COND
 [FLT]       (REGEX "^CS?V?T?" "CT" 2
 [FLT]        <0
 [FLT]        |
 [FLT]        (COPY 0xEAB)
 [FLT]        (COPY 0xEC9)
 [FLT]        | 2>))
 [FLT]      (COND)))
 [FLT]   (STAGE 1 " CT " (| 0EAB 0EC9 |)
 [FLT]     (SUBPART 0
 [FLT]      (COND
 [FLT]       (REGEX "^ ([^ ]*) " " CT " 4
 [FLT]        (SUBPART 1
 [FLT]         :otf=lao =)))
 [FLT]      (COND)))
 [FLT]   (RESULT 00-01 (04CB 576 0 0) (04DC 0 -576 -16)))